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Jing L. Marantz

CIK 1834528 · CHIEF MEDICAL OFFICER · last filed 2026-06-15

Jing L. Marantz is a CHIEF MEDICAL OFFICER who has filed 20 SEC Form 4 insider transactions across 3 companies since 2021. The most recent filing, for ARCT, was dated Jun 15, 2026. Across all open-market trades the lifetime net is −$4.1M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $6.2M across reported positions.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

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Disclosed Exposure

$6.20M

Companies

3

Total Filings

20

Lifetime Open-Market Net

-$4.06M

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
ARCT Director 3,131 $5.79 $18.1K $0 6 2026-06-15
SRRK CHIEF MEDICAL OFFICER 126,012 $49.06 $6.18M -$4.06M 10 2026-02-19
KRYS Chief Business Officer — $363.28 — $0 3 2022-01-31

Recent Filings

20 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2026-06-15 ARCT Grant (A) — $0 EDGAR
2026-02-19 SRRK Sell (S) −4,157 -$193.4K EDGAR
2026-02-11 SRRK Grant (A) +34,482 $0 EDGAR
2026-01-21 SRRK Sell (S) −5,798 -$257.9K EDGAR
2025-06-11 ARCT Grant (A) — $0 EDGAR
2025-03-12 SRRK Grant (A) +34,285 $0 EDGAR
2025-01-21 SRRK Sell (S) −5,655 -$249.9K EDGAR
2024-11-26 SRRK Mixed — -$242.6K EDGAR
2024-11-13 SRRK Mixed — -$45.1K EDGAR
2024-10-07 SRRK Notice (144) −120,000 -$3.90M EDGAR
Showing 1–10 of 20
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Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.